Overedge sewing machine



June 16,1931. K. MAIER OVEREDGE SEWING MACHINE Filed Feb. 28, 1927 4 Sheets-Sheet 1 June 16, 1931. K. MAIER OVEREDGE S EWING MACI 'IINE 4 Sheets-Sheet 2 Filed Feb. 28, 1927 June 16, 1931. y K MAIE'R 1,810,617

OVEREDGE SEWING MACHINE Filed Feb. 28, 1927 4 Sheets-Sheet '5 June 16, 1931. K. MAIER 1,810,617

OVEREDGE SEWING MACHINE Filed Feb. 23, 192"! 4 Sheets-Sheet 4 I partly in front elevation,

Patented June 16', 1931 KARL F S'BUTTGART, GERMANY ASSFGNOR TO UNION SPECIAL MASCHINEN EABRIK, a. ma. n.- or

T'lG-ABT, GERMANY cvnannen snwrne MACHINE Application filed Febrnary 28,1927 Serial No. 1715583, and in. Germany March 25, 1926.

The invention relates to new and useful improvements in sewing machines, and more particularly to a .sewing'machine for forming overedge stitchs. i An object of the invention is to provide a sewing machine of the above t pe having means for holding the interloc ed thread loops laid over the edge of the material, with means for shifting said holding means for the thread loops while the machine is in operation. A. further object of the invention is to provide a machine of the above type having a thread drawing means for the overedge thread," with means for varying the amount of thread drawn oil to correspond to the position of the holding means for the thread loo s.

further object of the invention is to prvide a machine of the above character having a'tension through which the overedge thread is led, with'means for automatically varying thetension as the. thread holding means is adjusted.

A further object of the invention is to grovide a sewing machine .of the above type aving means-for shifting the thread loop holding means, the thread drawing means, and varying the tension on the thread, with means whereby the positionof the thread loop holding means may be shifted relative to the thread drawing and tension varying means.

These and other objects will in part be obvious and will in part be hereinafter more fully disclosed.

in the drawings- Figure is a'view partly in section and showing a machine embodying the improvements;

ly above the Work su port;

3 is a sectiona view on the line A--B a s- Fig. i is a view of a portion of the machine firornthe rear of the machine, and showing the means- "-for-' .varying the tension on the threadif Z 5 is a frhnt view of the threaddrawing ofi -device hen at one extreme end of its stroke; l

Fig. 2 is a plan view of the machine direct- Fig. 6 is a similar view showing the thread drawm device at the other end of its stroke;

Fig. isa view of the thread'drawin ofi' device at the opposite end of its stroke rom that shown in g. 1;

Fig. 8 is a plan view on an enlarged scale showing one form of article produced by the machine;

Fig. 9 is a similar view, butshowing the overedge thread loops as very much lengthened by the shifting the thread loops Fig. 10 is -a plan view showing a hat with a hat-brim attaching ribbon applied thereto, which was formed on the machine;

Fig. 11 is a sectional view on the line (3-1) of Fig. 10;

Fig. 12 is a sectional of Fig. 10, and

Fig. 13' shows diagrammatically a pattern siam which can be made by the improved mac me.

. The invention is diredted broadly to a machine forforming overedge stitches, wherein the overedge thread loops are held by means which determine the length of these .overs when the stitches are set.

edge .thread 100 of the holding means for view on the line E-F The means for ormin the overedge thread esired character, and

loops maybe of an the overedge thread the means for holdmg loops'may be of different types. in one formof the invention, a finger is provided around which the thread loops are laid, and against which they are drawn when the stitches are set. This fin er is carried by a swinging arm which is shi ed manually during the running of the machine, if desired, for'varying the lengths of the'overedge thread loops.

' 'lhis enables various patterns or' characters oftoveredge seams to be made. Thefinger is shifted by a rock shaft which may be operated by a pattern cam, ated b a suitable knee shift or treadle controlle device. The machine is also provided with means for. drawing oif thread for an overed e thread loop, and devices are also provi ed whereby the amount of thread drawn off may be varied by the position of the linger around which the overedge thread loops are formed; A tension is providedfor or which may be oper-- the thread forming the overedge thread loops, and means is also provided whereby this tension may be varied to accord with the position of the finger around which the overwhich carries an overhanging arm 1. Mounted to reciprocate in the free end of the. overhanging arm -1 is a needlebar, which is pro: vided with a needle 3. Mounted on the bed is a'work support carrying a throat plate 2.

This throat plate 2 is provided'with the usual feed slots through which the feed dog operates. Cooperating with the needle 3 beneath p the work support is a thread carrying memher 3, and cooperating with this thread carrying member 3, isan overedge thread oarrying looper 4, hi h for n ov r d e articularly useful for forming an edglng 85 thread loop and positions the same so that it is locked by the needle thread loops as they are formed by the needle. The'features just described are very common in an overedge "sewing machine, and further detail description thereof is not thought necessary.

Adjacent the needle is a finger 5 carried by a bracket arm 7 pivoted at 6 to the cloth p a to of the machine. This finger lies alongside ofthe needle 3, and is so positioned that the overedge thread loops are laid over this finger, and when they are drawn down to set I the stitches, they are drawn against the fin- The position of the finger regulates the 61 Iength ofthe overedge thread loops, and thusit might be called the width of the overedge stitch.

- This bracket 7 is capable of being shifted on its pivotal su port. This is accomplished by a link- 8 whic is pivoted to an arm 9 carried bya rock shaft 10. The rock shaft 10 carries an arm 11 'which may be connected to a treadle, a knee shift, or to a pattern cam, if desired, so that the arm 11 can be shifted automatically .or manually, at will. The arm can be manually shifted at-will, or automatically shifted, during the running of the machine, if desired. vWhen this arm 11 is shifted it will rock the shaft 10, and through the link Swill shift the finger 5. In. Fig. 2

. of the drawings, the finger is shown in full lines in one position and in dotted lines in another position.

In Fig. 13 of the drawings, there is shown diagrammaticall an edging seam S, which can be made on t e above machine by a shifting of the finger 5. It will be noted from this figure of the drawings that the needle forms the thread loops at the left of the figure, while the overedge loops are interlocked at 8' at the right of the seamin the waved line. This; is due to the fact that the finger has gradually moved away from the 'needle and then gradually movedtoward the needle,

thus forming, in effect, a scalloped edge.

It will be noted that the finger 5 is separatefrom the bracket arm 7 and is secured thereto by a screw 5, so that the finger may be removed from the machine. The bracket arm 7 is provided with a guiding recess 17 which enables a wire or rod or a similar element'to be guided b this recess 17 alongside of the needle. In t is case, the rod or wire or element which passes through the recess 17v serves as a means around which the thread loops are formed. The thread loops do not pass off from the end of the wire or rod, but the rod goes through the machine and'bethus vary the length of the overedge thread loops. Thus it is that the machine becomes or the brimof'a hat. In Fig. 10 of the drawin s, a hat is shown at 13, which hat is provi ed with the usual brim 12.

An edging ribbon is indicated at 14:. On

the interior of the hat rim there is a resilient go rim 15 of steel wire or the like. The machine may be used for forming'theedging for a hat by guiding the resilient rim 15 through the recess 17 in the bracket arm 7, and by .direct ing theedging ribbon 14: through a suitable guiding channel so that the needle will pass thread loops through the edge of the ribbon. As shown in Figures 1 and 2 of the drawings, this uiding channel is formed by a plate 50 whlch is provided with a guid- 10G ing rib 16 at the end thereof adjacent the needle, and with an adjustable edge guiding plate 18. Screws 19'pass throu h slots in the plate 18 and serve as ameans or holding the plate in adjusted positions, so that the 5 guiding channel for the ribbonmay be varied as to width in order to accommodate the desired width of ribbon. 'Acoyer member 38 hinged to the plate 50 may be used, and a spring 5T" provided for holdin cover plate 3 down on the ribbon as 0 early shown in Fig. 2 of the drawings; This merely closes the channel, and a the ribbon runs" through the guiding channel beneath this cover plate 38.

In Fig. 8 of the drawings, the" 'bbon 14 is shown. as secured to the rim 15- by overs edge stitches which include needle thread loops in the looper threads Z Z may pass around the rim 15. It will be noted that atone part in the edging ribbon for the hat,

the rim should be close to the ribbon, while at another point in the edgin ribbon, the rim should be at a considerable 5i this 110 The cover plate may be 115 readily raised to remove the ribbon or replace the ribbon whenever desired.

stance from the ribbon. This is accomplished by manually shifting the arm 7, and thusle'ngthening the overedge thread loops, as shown in Fig. 9. The length of the thread loops is varied merely by the position of the steel wire rim15. f

It will be obvious, of course, that many other articles can be formed on my improved machine by using this manually shiftable bracket arm' provided ,with means around which the thread loops are formed and drawnup. I

Each looper thread 1, Z is led from the supply through a tension 23. This tension consists of the usual tension disks, which are held pressed one against the other by a spring 24. The tension disks and the spring are all mounted on a rod 26,'and nuts 25 may be used for varying the tension ofthe spring against the tension disks. After leaving the tension disk 23, the looper thread passes through a thread eye 21 carried by an arm;

, which is fixed to the rock shaft 10. It is then led through a thread guide carried at the lower end of the needle lever extension 22. From this point the thread passes to the thread carrying looper. As the needle lever oscillates, the thread guide 20 will be moved toward and from the thread guide 21, and it will be obvious that the amount of thread drawn oil will depend upon the position of the thread guide 21. This thread guide 21 being carried by the rock shaft 10, is shifted when the rock'shaft is oscillated. When the rock shaft is oscillated, the bracket arm 7 is shifted,.an'd therefore, the position 'of the thread guide 21'will be automatically varied by the shifting of the bracket arm 7 Starting with the parts as positioned in Fig. 1, let it be assumed that the arm 11 remains in'the position indicated in this figure, for astitch eycle. During that time, the thread. guide 21 will remain in a fixed position. As the needle rises, the thread guide 20 will be moved to the left, as viewed in this figure, and-to the position indicated in Fig. 5. As the needle comes down, then the thread guide 21 will move again to the right. v When the parts again reach the position shown in Fig. 1, the center'lines of thethread guides -21 and 20, indicated at a and b, will coincide.- That'is, the thread guide 20 has moved from the line a, Fig. 5', to the line b, Fig. 5, in a direction indicated by the arrow X, and has covered a distance indicated by A. During this movement, there has been no drawing efi'ect on the looper thread. It has been what might be called an lidle movement. As the needle continues its down stroke, the needle lever extension 22 will continue to move to the right tothe position shown. in Fig. 6. The center line b of the thread ide 20 has moved away from the center line a of the thread guide 21, a distance indicated at B, and this draws on the thread and pulls thread through the tension from the supply. It will readily be seen thatby shifting the arm 11, the thread guide 21 will be shifted and the amount of thread drawn off .will be varied. For example, i 21 is shifted to the position shown in Fig. 7, then the distance between the center line a and the center line ,b will be less, as indicated at O. f

Means has been provided for varying the tension on the looper thread when the bracket arm 7 is shifted. This is accomplished by providing a cam 27 which is' attached to an when the thread guide.

arm 35 by screws 37. The arm 35 is fixed to i I the shaft 10. Extending through the stand-- ard of the machine is a rod 29. This rod 29 is mounted in abearing sleeve 28, and the end of the'rod 29 is mounted and positioned so as to engage the cam 27; The rod at its other end, carries a plate 30 which is forked so as to straddle the rod 26 on which the tension disks 23 are mounted. This plate 30 serves as an abutment against which the tension disks 23 are held pressed together by a spring 24, and of course, if the forked plate 30 is shifted, the tension on the thread will be varied. In Fig. 1 of the drawings, I have shown two tensions 23, and the late 30 has a fork at each end thereof, one or each ten sion. This second'tension'would be used pro vided the lower thread carrying element o the stitch forming mechanism is a threaded element.

A spring 36 secured to the bed of the ma.- chine and to the arm 35 normally operates to turn the rock shaft 10 in a c1ockwise direc tion; At the back'of the machine, there is a post 33 provided with stop collars 34, and the lower stop collar limits the downward. movement of the cam through the action of this spring. The upper stopcollar 34s limits the downward movement 0 the free end of the arm 11.

The link 8 as clearlyshown in Fig. 1, is i made in septions, andythese sections. are joined by a sleeve 31. vThe set screws 32 attach the sections of thelink to-the sleeve.

By loosening these set screws, the link'may be lengthened or shortened, and thus the bracket arm 7 properly positioned relative to the set-position of the rock shaft 10 deter- I mined by the. stops 34,

From the above it will be apparent that I have provided .an overedge sewing machine having means for 'regulatin the length of.

the overedge thread loops, w ich' means can be manually shifted at will, and I have also provided automatic means for-varying the.

amount of thread drawn oil and the tension on the thread, as the holdin means for the overedge thread loops is shi ted,\-so that the thread drawn ofi' and the tension on the thread may be adapted to the proper length" of overedge thread loop.

It is obvious that minor changes in the details of construction and the arrangement of the parts may be made without departing from the spirit of the inve'ntion'as set forth in the appended claims.-

Having thus described the invention, what I claim as new and desire to secure by Letters-Patent, is-

1. The combination of cooperating stitch forming elements for forming overedge thread loops, means for holding said overedge thread loops when the stitches are set, means whereby said thread loop holding means can be shifted laterally for varying the position of the holding means during the running of the machine, means independent of the stitch forming elements for drawing thread from the supply for the overedge thread loops, and means for varying the amount of :thread drawn from the supply to correspond with the osition of the means for varying the overe ge thread loops.

2. The combination of cooperating stitch forming elements for forming overedge thread loops, means for holding said oversion from the supply, and means independent of the stitch forming elements for varying the amount of thread drawn from the supply to correspond with the positioning of the holdin means for the overedge thread loops.

3. The combination of stitching mechanism having means for forming overedge thread loops, means for holding said overedge thread loops when the stitches are set, means where- .by said thread loop holding means can be shifted for varying the position of the holding means during the running of the machine, a tension for the thread forming the overedge thread loops, means for drawing said thread through the tension from the supply, said means for shifting the holding means for the overedge thread loops including a rock shaft, said means for drawing, the thread from the supply having a thread eye positioned by said rock shaft, a cam for varying the tension on the-thread, and means carried by the rock shaft for positioning said cam, whereby when said roc'k shaft is oscillated to vary the position of the thread loop holding means, the tension is variedv and the amount of thread drawn off isvaried to correspond with the positioning of said holding means. A 4. An overedge sewing machine comprising stitching mechanism including a needle,

5' afbracket armymeans for pivotally supporthing saidbrack 55 arm, a finger carried by said bracket arm and located alongside 'of said of the bracket arm.

a link connecting the rock shaft to saidbracket arm including devices whereby said link may be lengthened orv shortened.

5. An overedge sewing machine comprising stitch forming mechanism including a needle, a bracket arm, means for pivotally supporting said bracket arm, means carried by said bracket arm and extending alongside of the needle around which the overedge stitches may be formed, a rock shaft having an arm connected to said bracket arm for shifting the same when the rock shaft is oscillated, means' whereby said rock shaft may be oscillated, means for drawing an overedge thread from the supply including a. thread guide carried by said rock shaft whereby when said rock shaft is oscillated to shift the bracket arm, saidthread guide is also shifted, and the amount of thread drawn off from the supply varied to accord with the position 6. An overedge sewing machine comprising stitch forming mechanism including a needle, a bracket arm, means for pivotally supporting said bracket arm, means carried by said bracket arm and extending alongside of the 'needle around which the overedge stitches may be formed, a rock shaft having an arm connected to said bracket arm for shifting the same when the rock shaft is oscillated, means whereby said rock shaft may be oscillated, means for drawing an overedge thread from the supply including a thread guide carried by said rock shaft whereby when said rock shaft is oscillated to shift the bracket arm, said thread guide is also shifted, and the amount of thread drawn I off from the supply varied to accord with the position of the bracket arm, a tension for the overedge thread, and means carried bysaicl rock shaft for Varying the tension when the bracket arm is shifted.

a 7. An overedge sewing machine comprising stitch forming mechanism including a needle, a bracket arm, meansfor pivotally supporting saidbracket arm, means carried by said bracket arm and extending alongside of theneedle over which the overedge thread loops are laid, means for guiding a body fabric to said needle, manually controlled means for shifting the position of said bracket arm laterally foryaryin the length of the thread loops in thepvere ge stitches, said last-named means including a rock shaft, a link, connecting said rock shaft to said bracket arm, a spring for oscillating said rock shaft in one direction, means whereby said rock shaft may be oscillated in the opposite direction, and stops for limiting the movement of the rock shaft, said link having means whereby the same may be lengthened or shortened.

8. The combination of stitch forming elements for forming overedge thread loops, means for holding said overedge thread loops when the stitches are set,'means whereby said thread loop holding means can be shifted laterally for regulating the size of the formed thread loops, means independent of the stitch forming elements for drawing thread from the supply for the overedge thread loops, and means for simultaneously shifting the thread loop holding means and varying the amount of thread drawn from the supply to correloop holding means, varying the tension on the thread, means for varying the amount of thread drawn from the supply to correspond with the position of the holding means, said last named means including a lever, a spring for moving the lever in one direction, means for manually moving the lever in the opposite direction, and stops for limiting the movement of the lever.

In testimony whereof, I afiix my signature.

KARL MAIER.

spend with the position of the holding means.

9. The combination of stitch forming elements for forming overedge thread loops, means for holding said overedge thread loops when the stitches are set, means whereby said thread loop holding means can be shifted laterally for regulating the size of the formed thread loops, means independent of the stitch forming elements for drawing thread from the supply for the overedge thread loops, a tension from the thread forming the overedge thread loops, means for simultaneously shifting the thread loop holding means, varying the tension on the thread,'and varying the amount of thread drawn from the supply to correspond with the position of the holding means.

10. The combination of a stitch forming mechanism having means for forming overedge thread loops, means for holding said overedge thread loops when the stitches are set, means whereby said thread; loop holding means can be shifted laterally for regulating the size of the formed thread loops, means for drawing thread from the supply for the overedge thread loops, means for simultaneously shifting the thread loop holding means and varying the amount of thread drawn from the supply to correspond with the position of the holding means, said last named means including a lever, a spring for moving the lever in one direction, means for manually moving the lever in the opposite direction, and stops for limiting the movement of the lever.

11. The combination of a stitch forming mechanism having means for forming overedge thread loops, means for holding said overedge thread loops when the stitches are set, means whereby said thread loop holding means can be shifted laterally for regulating the size of the formed thread loops, means for. drawing thread from the supply for the voveredge thread loops, a tension from the thread forming the overedge thread loops, means for simultaneously shifting the t ""2", 

